SOLUTION: How do I isolate "X" in the following equation? 105*(x/(x+70))+45*(x/(x+70))=100

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Question 804278: How do I isolate "X" in the following equation? 105*(x/(x+70))+45*(x/(x+70))=100
Found 2 solutions by josmiceli, solver91311:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+105%2A%28x%2F%28x%2B70%29%29%2B45%2A%28x%2F%28x%2B70%29%29=100+
You can multiply both sides by +%28+x%2B70+%29%2Fx+
with the provision that +x+ cannot = +0+
------------
+105+%2B+45+=+%28%28+x%2B70+%29%2Fx%29%2A100+
+150+=+%28%28+x%2B70+%29%2Fx%29%2A100+
Divide both sides by +100+
+1.5+=+%28+x%2B70+%29%2Fx+
Multiply both sides by +x+
+1.5x+=+x+%2B+70+
+.5x+=+70+
+x+=+140+
check answer:
+105%2A%28x%2F%28x%2B70%29%29%2B45%2A%28x%2F%28x%2B70%29%29=100+
+105%2A%28140%2F%28140%2B70%29%29%2B45%2A%28140%2F%28140%2B70%29%29=100+
+105%2A%282%2F3%29+%2B+45%2A%282%2F3%29+=+100+
+35%2A2+%2B15%2A2+=+100+
+70+%2B+30+=+100+
+100+=+100+
OK

Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


You can't. X is not in the given equation. x is, but X and x are two different things.

John

Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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